If WCS information is present in the FITS image header, SAOimage
versions from 1.12 track world coordinate systems as well as pixel
coordinates within the image. In versions 1.17 and later, spatial WCS
information is extracted from IRAF .imh (OIF) images as well. Several single
command line options have been added:

-fk4 -b1950

If WCS information is available in the image header, track the cursor
in FK4/B1950 right ascension and declination as well as pixel
coordinates.
These coordinates, followed by B1950 will be fed to an external
program if the w command is used.

-fk5 -j2000

If WCS information is available in the image header, track the cursor
in FK5/J2000 right ascension and declination as well as pixel coordinates.
These coordinates, followed by J2000 will be fed to an external
program if the w command is used.

-fncommand

This command will be executed when the fn key is struck,
after the following substitutions are made:

%s becomes the world coordinate string as displayed by the tracker,

%f becomes the name of the file being displayed, and

%x is replaced by the image X and Y coordinates.

Underscores should be used instead of spaces.

-gal -galactic

If WCS information is available in the image header, track the cursor
in galactic longitude and latitude as well as pixel coordinates.
These coordinates, followed by galactic will be fed to an external
program if the w command is used.

-wcscom command

This command will be executed when the w key is struck,
after the following substitutions are made: